Specificity of iron transport in iron-stressed sugar beet plants: evidence for preferential accumulation of cobalt in the presence of iron

1984 ◽  
Vol 62 (2) ◽  
pp. 207-210 ◽  
Author(s):  
Terry F. Young ◽  
Norman Terry
Keyword(s):  
Sugar Beet ◽  
Transport System ◽  
Iron Transport ◽  
Manganese Zinc ◽  
Preferential Accumulation ◽  
Metal Contents

Cobalt treatment of iron-stressed sugar beet plants resulted in leaf cobalt concentrations nearly three times as high as in cobalt-treated control plants. When iron-stressed plants were treated with cobalt and iron together, cobalt was transported into leaves in preference to iron. The transport system in iron-stressed sugar beet appears to be relatively specific for iron and cobalt because iron-stressed plants supplied with manganese, zinc, and copper did not transport these elements in similarly enhanced amounts. Measurements of metal contents of chloroplasts isolated nonaqueously showed that both cobalt and iron were readily transported into chloroplasts (and therefore the leaf symplast) within 48 h. The implications of these results on the mechanism of iron transport across the root plasmalemma are discussed.

Kinetics of iron transport into the leaf symplast during recovery from iron stress

1983 ◽  
Vol 61 (9) ◽  
pp. 2496-2499 ◽  
Author(s):  
Terry Forrest Young ◽  
Norman Terry
Keyword(s):  
Sugar Beet ◽  
Leaf Blade ◽  
Iron Transport ◽  
Iron Stress ◽  
Manganese Zinc ◽  
Iron Deprivation ◽  
Kinetics Of ◽  
Iron Concentrations

The iron concentrations of chloroplasts (isolated by nonaqueous methods) and of chloroplast lamellae (isolated by aqueous procedures) were determined and used to investigate the kinetics of iron transport across the plasmalemma into the leaf symplast during the recovery of sugar beet plants from iron stress due to iron deprivation. Iron concentrations in chloroplasts isolated by the nonaqueous procedure were greatly reduced during iron stress and recovered to over 200% of control levels within 24 h. Iron concentrations in lamellae from aqueous isolations increased significantly within 24 h of resupply and reached values in excess of control levels in 48–72 h. These results indicate that a substantial quantity of the iron that entered the leaf blade during the first 24–48 h of iron resupply crossed the plasmalemma. The effect appeared to be specific to iron because there was no evidence that manganese, zinc, and copper were transported into chloroplasts and lamellae in enhanced amounts.

scholarly journals Evaluation of mineral and heavy metal contents in Croatian blackberry wines

2011 ◽  
Vol 29 (No. 3) ◽  
pp. 260-267 ◽  
Author(s):  
D. Amidžić Klarić ◽  
I. Klarić ◽  
D. Velić ◽  
I. Vedrina Dragojević
Keyword(s):  
Heavy Metal ◽  
Point Of View ◽  
Anthropogenic Source ◽  
Cobalt Chromium ◽  
Manganese Zinc ◽  
Metal Contents ◽  
Copper Manganese ◽  
Calcium Magnesium ◽  
Positive Correlations ◽  
Manganese Magnesium

The mineral and heavy metal contents in 17 commercially available Croatian blackberry wines were determined by FAAS/FAES and GFAAS. The concentrations of potassium, sodium, calcium, magnesium, iron, copper, manganese, zinc, cobalt, chromium, and cadmium were between (in mg/l) 924–1507, 11.81–120.10, 86.4–457.1, 183.4–381.2, 0.082–6.273, 0.058–0.767, 1.47–11.53, 0.247–6.645, and (in µg/l) 3.21–11.89, 10.08–15.88, and 0.55–9.9, respectively. A negative correlation was found between the concentrations of macro (Mg) and micro (Fe) minerals. Furthermore, positive correlations were observed between the concentrations of manganese, cadmium, and cobalt that indicated the origin of these elements in the anthropogenic source. Multivariate analyses (PCA/LDA) showed that the distinct patterns of the metal contents in blackberry wines could be identified with quite satisfactory accuracy (sensitivity and specificity) with the subregion of the origin. In regard to the results obtained, Croatian blackberry wines could be considered as safe from the health risk point of view and as a good additional source of the essential nutrients investigated such as manganese, magnesium, and potassium.

scholarly journals Genetics and Virulence Association of the Shigella flexneri Sit Iron Transport System

2009 ◽  
Vol 77 (5) ◽  
pp. 1992-1999 ◽  
Author(s):  
Carolyn R. Fisher ◽  
Nicola M. L. L. Davies ◽  
Elizabeth E. Wyckoff ◽  
Zhengyu Feng ◽  
Edwin V. Oaks ◽  
...  
Keyword(s):  
Epithelial Cells ◽  
Transport System ◽  
Iron Transport ◽  
Shigella Flexneri ◽  
Lung Model ◽  
Mouse Lung ◽  
Wild Type ◽  
Insertion Elements ◽  
Wild Type Parent

ABSTRACT The sit-encoded iron transport system is present within pathogenicity islands in all Shigella spp. and some pathogenic Escherichia coli strains. The islands contain numerous insertion elements and sequences with homology to bacteriophage genes. The Shigella flexneri sit genes can be lost as a result of deletion within the island. The formation of deletions was dependent upon RecA and occurred at relatively high frequency. This suggests that the sit region is inherently unstable, yet sit genes are maintained in all of the clinical isolates tested. Characterization of the sitABCD genes in S. flexneri indicates that they encode a ferrous iron transport system, although the genes are induced aerobically. The sit genes provide a competitive advantage to S. flexneri growing within epithelial cells, and a sitA mutant is outcompeted by the wild type in cultured epithelial cells. The Sit system is also required for virulence in a mouse lung model. The sitA mutant was able to infect the mice and induce a protective immune response but was avirulent compared to its wild-type parent strain.

New synthetic probes of the iron transport system of Paracoccus denitrificans

Tetrahedron ◽  
1994 ◽  
Vol 50 (40) ◽  
pp. 11781-11792 ◽  
Author(s):  
George M. Buckley ◽  
Gerald Pattenden ◽  
Donald A. Whiting
Keyword(s):  
Transport System ◽  
Iron Transport ◽  
Paracoccus Denitrificans

scholarly journals Differential expression of Bordetella pertussis iron transport system genes during infection

2008 ◽  
Vol 70 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Timothy J. Brickman ◽  
Tomoko Hanawa ◽  
Mark T. Anderson ◽  
Ryan J. Suhadolc ◽  
Sandra K. Armstrong
Keyword(s):  
Differential Expression ◽  
Transport System ◽  
Bordetella Pertussis ◽  
Iron Transport

Characteristics of light-regulated iron transport system in barley chloroplasts

1997 ◽  
pp. 157-161
Author(s):  
N. Bughio ◽  
M. Takahashi ◽  
E. Yoshimura ◽  
N. K. Nishizawa ◽  
S. Mori
Keyword(s):  
Transport System ◽  
Iron Transport
Sign in / Sign up

Export Citation Format

Share Document